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PHP Integrating PHP with Databases Querying the Database with PHP Working with Results

how do i execute this code challenge am lost

am lost here

index.php
<?php
include "helper.php";

/* 
 * helper.php contains
 * $results->query("SELECT member_id, email, fullname, level FROM members");
 */
try {
  $results = $db ->query("SELECT member_id, email, fullname, level FROM members");
}